Brocock Bantum Sniper HP

wha...wait... this is a common occurrence for the Brocock ?? how come this wasn't brought up in the numerous review of this gun ?

Is the new ring seating properly? Make sure no remnant of old ring or anything is in the gland. I can't think of anything else as this doesn't seem to be a common problem. Does it blow out with all pellets or are certain ones/one disengaging it; or is it being blasted out?

The guys with the Red Wolf HP were replacing the Buna N 70 duro oring with a Viton 75 and having success. 

It can also have a lot to do with bolt lock up. If the probe/ bolt face are misaligned or not closing properly it will cause this over time. Not a common issue and you probably need to return for warranty repair. It can also be caused by a tight fitting pellet that hinders that last tiny bit of bolt closure. Easy to miss if you are rushing. I did it twice but only lost the o ring once. Tried shooting slugs and they were very tight. O ring was hanging on the probe when I opened the bolt. All my fault but easily fixed. If it fits tight I now make sure the bolt is securely closed all the way. Hope this sheds some light.

My Daystate used to chew up bolt probe o rings until i switched to a urethane .

I have a Regular Brocock Bantam HR Sniper in .22 shooting at over 33 foot pounds and after thousands of rounds I have never replaced the factory breach seal and it's still good.I do however lube my pellets.

I have a Regular Brocock Bantam HR Sniper in .22 shooting at over 33 foot pounds and after thousands of rounds I have never replaced the factory breach seal and it's still good.I do however lube my pellets.

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Same experience here. I shoot a combination of lubed and unlubed pellets, can't tell a difference with JSB pellets. No problem with the breech seal.